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What magma compositions will be produced by partial melting of the upper mantle?
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What is responsible for the partial melting of peridotite?
In the mantle, temperatures range between 500 to 900 °C (932 to 1,652 °F) at the upper boundary with the crust; to over 4,000 °C (7,230 °F) at the boundary with the core.Although the higher temperatures far exceed the melting points of the mantle rocks at the surface (about 1200 °C for representative peridotite), the mantle is almost exclusively solid. The enormous lithostatic pressure exerted on the mantle prevents melting, because the temperature at which melting begins (the solidus) increases with pressure.
What processes causes the formation of magma?
Partial melting of rock produces a magma. When rock is heated (by the heat emanating from the Earth's core) it DOES NOT all melt at the same time. In the same way that adding antifreeze to water prevent it freezing, certain mixtures of elements (from the minerals making the rock) melt out first to form a liquid. These melts flow together from between the mineral grains to make the magma. This process of partial melting produces PARTICULAR magma compositions depending on the make up of the source rocks which is why magmas have definite chemistries and are different in different places. Basalts are made from partial melts of the upper mantle, Andesites are magmas made from partial melts of the crust etc.
Earth is divided into three layers by chemical compositions Which layer is largest?
Mantle
Does every volcano form in the mantle?
No, the Earth's mantle is to deep and warm for this. Magmas are generated in the upper mantle by a process called partial melting and the melt collects in the crust (in magma chambers at varying depth).
How are pressure and heat involved in melting rock in the mantle?
It is involved in the Mantle because heat Is used for the temepeter and pressure is for how close the mantle is
Basalt is generated by?
partial melting of mantle rocks
What happens when water is added to rock in the mantle?
It causes a lowering of the melting temperature of the material, which in turn can cause partial melting of the mantle material leading to the formation of magma.
Most basaltic magmas are believed to form by partial melting of granite in the lower crust and upper mantle?
This statement would be considered incorrect. Basaltic magmas originate from the melting of mantle rock or oceanic crust.
When solid mantle rock rises during seafloor spreading magma is produced as a result of decompression melting?
Yes.
What is responsible for the partial melting of peridotite?
In the mantle, temperatures range between 500 to 900 °C (932 to 1,652 °F) at the upper boundary with the crust; to over 4,000 °C (7,230 °F) at the boundary with the core.Although the higher temperatures far exceed the melting points of the mantle rocks at the surface (about 1200 °C for representative peridotite), the mantle is almost exclusively solid. The enormous lithostatic pressure exerted on the mantle prevents melting, because the temperature at which melting begins (the solidus) increases with pressure.
A majority of the melts in the Earth form through the partial melting of ultramafic mantle rock These newly-formed magmas are?
Newly formed magmas are usually mafic.
What processes causes the formation of magma?
Partial melting of rock produces a magma. When rock is heated (by the heat emanating from the Earth's core) it DOES NOT all melt at the same time. In the same way that adding antifreeze to water prevent it freezing, certain mixtures of elements (from the minerals making the rock) melt out first to form a liquid. These melts flow together from between the mineral grains to make the magma. This process of partial melting produces PARTICULAR magma compositions depending on the make up of the source rocks which is why magmas have definite chemistries and are different in different places. Basalts are made from partial melts of the upper mantle, Andesites are magmas made from partial melts of the crust etc.
What happens to this crust as it is pushed down into the mantle?
As it is cold and wet, it continues to sink and slowly heats up. This causes partial melting and it acts as a source of magma for volcanoes that form above it. so does other people burn when the go into mantle?
How do hotspots form?
Hotspots are thought to form due to mantle plumes. This is the upwelling of high temperature material from deep within the mantle. This high temperature material causes partial melting of the shallow mantle and overlying crust leading to a "hotspot" and volcanism.
Is the temperature of the stiffer mantle above of below its melting point?
is the temperature if the stiffer mantle above or below its melting point
Is the stiffer mantle above or below the melting point?
is the temperature if the stiffer mantle above or below its melting point
Is the following sentence true or false when solid mantle rock rises during seafloor spreading magma is produced as a result of decompression melting?
true
